Afd.sys can't start on Windows 7

Hi all,
I just had an automatic windows update which restarted my laptop (without my consent!) and since then, the internet connection on that PC is dead. The HTTP service can't start, the spooler for printer neither, so all installed printers have disappeared.
The update log shows that afd.sys has been replaced and doesn't start anymore hence the problems.

I've searched the internet for solutions and apparently afd.sys corruption seems to be a rather common problme. I tried this

Code:

sfc /scannow

the command stopped at 78% completion and in the log file, I find this

I've retrieved an original afd.sys from the installation CD (by decompressing it from the cd's file "Install.vim"), replaced c:\windows\system32\drivers\afd.sys with it and restarted.
But afd.sys doesn't load and a new sfc /scannow yields the same error (stop at 78% completion, & same error message).

Mirroring is a RAID term... When you say " I've desactivated all auto-upgrade, protection, firewall... services", exactly what are these?

Click to expand...

They are security options in the System configuration menu : Windows Update, firewall and in the Microsoft Security Esential option : Window defender & Antivirus protection. I have them in "desactivated" mode.